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- Wire C and wire D are made from the same material of resistivity p- 2.0 x 10 am. The length and radius of wire Care Le 1.0m and re 2.00 mm, and those of wire D are Le- 0.50.m and ro-0.75 mm. The wires are joined as shown in the figure. What is the resistance R between points 1 and 2?What is the resistance of copper wier that is 3.5m long and has a diameter of 2mm (p=1.68x10-80.m) 0.01870 a O 0.00472 .bO 0.0470 .cO 0.001870.d Oa). A circuit consist of five resistors connected as below, determine the effective resistance in the circuit. RI R2 Given that R1, R,Rs,RA and Rs are given respectively as 50, 25, 30, 60 and 70Q, what is the current in the circuit if the potential aeross the resistors is 24 V?
- The resistances are R1 = 1 Ohm and R2=2 Ohm and the ideal batteries have emfs Ej= 2V and Ez-E3 =4V. Find the current in the circuit? Q4 R R ww R RConsider two copper wires. One has three times the cross-sectional area of the other. How do the resistances of these two wires compare? O The thicker wire has twice the resistance of the shorter wire. Both wires have the same resistance. O The thicker wire has half the resistance of the shorter wire. O none of the given answers hp N P. 88فير A conductor has a cross-sectional area of 2.3x 10-6 m and the number of free electrons per unit volume is 8.5x 10- electron/m. When the current is 8.6 A, find the drift speed (in mm/s) of the electrons. Use the charge of the electron to be 1.6x 10-19 C. Select one: OA 0.19 OB. 27.49 CC.036 C0.36.09 CE.027 page
- The resistance R of a piece of wire has thermometric properties which can be described as a linear function of temperature (T, in C), R=mT¹/2+n Where m and n are constants. The resistance of the wire is found to be 4.80 at the temperature of melting ice (0.0 ℃) and 9.30 № at the boiling of water (100 °C) at atmospheric pressure. a) Find the constants m and n. b) Determine the temperature when R is 7.95 №. c) Based on the information provided above, is this wire element suitable for determining temperature below 0 ℃?Given the temperature coefficient of resistivity of a certain wire to be 3.1 x10-3 (°C)-1.By what factor is the resistance of this wire changed when its temperature is increased from 20.0°C to 79.48 °C? R RoUsing Kirchhoff's rules, find the following. (E, = 71.0 V, E2 = 62.0 V, and E, = 79.8 V.) 4.00 ka |E, |E. Ra R$ 3.00 kN 2.00 kN R (a) the current (in mA) in each resistor shown in the figure above IR2 mA mA (b) the potential difference between points c and f (Give the magnitude of your answer in volts and select the point of highest potential.) magnitude of potential difference point at higher potential --Select--- v (c) What If? If all of the resistors in the circuit were decreased in value by a factor of 1,000, would the current in each resistor simply increase by a factor of 1,000? Explain your answer.
- A capacitor of capacitance C=40 pF capacitor is used in conjunction with a motor. How much energy (Joules) is stored in it when a voltage V=113 V is applied? A. None B. 0.5054 C. 0.5108 D. 0.2554 Е.0.1277 Next page Eo searchPlease determine what is asked 1. The resistance of a wire is R ohms. It is stretched to ten times its original length. What is the new resistance of the wire (in terms of R)? 2. The resistance of a wire of uniform diameter d and length I is R. Find the resistance (in terms of R) of another wire of the same material but with diameter 2d and length 41.Calculate the ratio of the resistance of 14.0 m of aluminum wire 2.4 mm in diameter, to 21.0 m of copper wire 1.6 mm in diameter. Express your answer using two significant figures. Hνα ΑΣφ Y 8 € n 0 α V n P o t x ΔΣΦΨΩ h RAI Ro = 0.45